Rope.



N0. 808,895. PATENTED JAN. 2, 1906.

U. H BILLMAN.

. ROPE.

APPLICATION FILED MAR.27, 1905.

UNITED STATES PATENT OFFICE.

No. sos,s95.

Specification of Letters Patent.

Patented Jan. 2, 1906.

Application filed March 27, 1905. Serial No. 252,205.

To (tZZ whom it may concern:

-of interferes effectually with its efliciency.

Where wire cables are used, they are liable to become rusted and suddenly give way under' strain. In some cases wire cables are used with an inner core of fibrous material; but in this particular case an extra pressure upon this inner core inwardly causes a stretch of the cable, which makes it ineffective in operation. Wire cables are sometimes used for this purpose which are served with fibrous material; but this serving soon becomes worn through and gives way, leaving the cable unprotected. Ropes also have been made in which the various strands are composed of wires around which a fibrous material is wound for the protection of each individual strand. Objections have been found also to this class of ropes, the wires wearing upon the fibrous material and causing it to yield and suddenly give way.

The present invention is designed to obviate all these objections; andit consistsin certain novel features of construction and arrangement of parts, which will be readily understood by reference to the description of the drawings and to the claims to be hereinafter glven.

Of the drawings, Figure 1 represents an elevation of a rope or protected cable embodying the features of this invention, the various strands thereof being shown partially unwound; and Fig. 2 represents a cross-section of the same on line 2 2 on Fig. 1.

Similar characters designate like parts throughout both the figures of the drawings.

In the construction of this rope or protected cable an inner core 10 is employed, consisting of aplurality of fine individual Wires twisted together to form a strand or inner core 10. Around this inner core 10 is laid or twisted in the ordinary manner a plurality of fine wires 11, twisted together, as in the case of the inner core 10. This forms a cable of considerable strength, and owing to the inner core being composed of a strand of fine wires the strands 12, twisted or laid around the same, are prevented from collapsing and permitting any stretch of the cable 13 thus formed. The cable 13 is wound or served with a flexible material, such as yarns of hemp, which protect the cable from the weather and at the same time offer a non-metallic surface for the'reception of the plurality of strands 15, of fibrous material, laid or twisted thereon in the usual manner. The strands 15 are each composed of a plurality of yarns twisted together in any well-known manner.

Each of the strands 15 is practically equal in area to the area of the cable 13, and in the preferred form the strand is made of hemp properly tarred, which is twisted or laid upon the cable 13, the twists conforming to the gen eral twist of the strands 12 of said cable, thus with the service 1 L effectually protecting the cable from wear and weather, while at the same time it forms a rope very flexible and suitable for use in the transmission of power.

In practice it has been found that a wire cable surrounded by strands of fibrousmaterial is liable to wear the fibers of said strands and soon destroy their efficiency. This objection is entirely obviated by the present construction of serving the inner cable 13 throughout its length with the flexible fibrous material 14:, as this service interposed between the wire cable 13 and the surrounding strands 15 prevents the destruction of the strands 15 from the inside. While the outer strands 15 are' herein shown and described as being made of fibrous material, it is obvious that these strands may be composed of rawhide or any other well-known material.

The cable 13 is so laid upon an inner core 10 that a stretching thereof is practically impos sible, while the strands 15 are of such a thickness as to thoroughly protect the cable-13 under all conditions, and a great amount of wear would have to occur before the cable 13 was uncovered and unprotected.

Vhen the rope is bent, the strands 15 are liable to be moved apart to uncover the wire cable 13; but with the serving 14 thereon ex posure of said cable is prevented at such times.

By making the lay or twist of the rope and cable the same the rope may be constructed on any ordinary rope making machine when properly adjusted so to do. A rope or protected cable thus constructed is very flexible and can pass around the smallest pulleys, while IIO there is practically no stretch whatever. The cable is thoroughly protected from wear and from the weather, so that its life is in no wise impaired, while the protection thereto, consisting of the twisted or laid strands 15 of substantially equal size to said cable, adds considerable to the strength of the rope and permits a greater hold upon the devices with which it cooperates.

It is believed that with the -foregoing the advantages and construction of a rope embodying the features of this invention will be thoroughly understood without further description.

Having thus described my invention, I claim 1. A rope comprising a wire cable served with a fibrous material wound thereon substantially at right angles to the axis of said cable, and a plurality of strands of fibrous material laid or twisted together over the same.

2. A rope comprising a core consisting of a cable composed of a plurality of strands twisted together, a fibrous material served thereon throughout its length by winding the same substantially at right angles to the axis of said core, and a plurality of strands of fibrous material laid or twisted together thereover.

3. A rope comprising a core consisting of a cable composed of a plurality of strands of fine wires twisted together, a fibrous material wound thereon throughout its length and substantially at right angles to the axis of said core, and a plurality of strands of fibrous material laid or twisted together thereover.

4. A rope comprising a core consisting of a cable composed of a plurality of strands of fine wire twisted together, a plurality of strands of fibrous material laid or twisted together thereover, and means for preventing contact between the wire strands and the outer fibrous strands. I

5. A rope comprising a core consisting of a cable composed of a plurality of strands of fine wires twisted together, a plurality of strands of fibrous material laid or twisted together thereover, and afiexible non-metallic covering interposed between the wire strands and the outer fibrous strands.

6. A rope comprising a core consisting of a plurality of strands of fine wires twisted together, a service thereon of hempen yarns CHARLES H. BILLMAN.

Witnesses:

VVALTER E. LO BARD, TINFRED V. HARRIS. 

